1. Ph.D. Candidate, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
2. Assistant Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
3. Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.